const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const cors = require('cors');

/* session 操作 */
const session = require('express-session');
const MySQLStore = require('express-mysql-session')(session);
const db = require('./db/index');

const sessionStore = new MySQLStore({}, db);

let indexRouter = require('./routes/index');
let usersRouter = require('./routes/users');
let productsRouter = require('./routes/products');

const app = express();

app.use(
  session({
    key: 'session_cookie_name', //自定义的会话Cookie名称
    secret: 'session_cookie_secret', //用于签名会话ID的密钥，应保密
    store: sessionStore,
    resave: true,
    saveUninitialized: false,
  }),
);

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(cors());

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/api/products', productsRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
